/Engine/Source/Runtime/NavigationSystem/Public/NavigationData.h
Finds a random location in navigable space, in given Radius
virtual bool GetRandomPointInNavigableRadius ( const FVector & Origin, float Radius, [FNavLocation](API\Runtime\Engine\AI\Navigation\FNavLocation) & OutResult, FSharedConstNavQueryFilter Filter, const [UObject](API\Runtime\CoreUObject\UObject\UObject) * Querier ) const